Backpack



FIG. 1 is a left-rear perspective view of the backpack, showing our new design;

FIG. 2 is a rear view of the backpack shown in FIG. 1;

FIG. 3 is a front view of the backpack shown in FIG. 1;

FIG. 4 is a left-side view of the backpack shown in FIG. 1;

FIG. 5 is right-side view of the backpack shown in FIG. 1;

FIG. 6 is a top view of the backpack shown in FIG. 1;

FIG. 7 is a bottom view of the backpack shown in FIG. 1; and,

FIG. 8 is a right-rear perspective view of the backpack shown in FIG. 1.

The broken lines in the figures are for the purpose of illustrating portions of the backpack and form no part of the claim. 

CLAIM The ornamental design for a backpack, as shown and described. 